Hello,
I’d like to make or design a score like a this attached reference(photo) as similar as possible.
My first question is, how can I change the slash-direction of grace note ? (marked red)
The second question is, as you see, the score has an extra bar-line (Actually, this notation is very strange for me 
). Has somebody any ideas to make this line? Thanks in Advance!
I know this may be considered unhelpful, but that is a very non-standard grace note slash. What is the purpose, exactly? You could do it with a Dorico line, which you can then transform to your heart’s content in Engrave mode, but it’s a lot of trouble for something odd, and for something that a player may not even notice, actually, or worse, stumble seeking the difference in meaning between a normal slash and that.
The extra barlines in your image are a weird way the engraver has indicated the time signature across three staves. Very non standard, and as is the case with a lot of non-standard notation - outright confusing. I don’t like that score very much! No reason you can’t improve it, is there? By simply normalising it.
And looks like the engraver has not slashed the previous graces, so it’s inconsistent as well.
I myself understand the desire or compulsion to reproduce scores exactly for various reasons, but I also feel it is OK to fix idiosyncrasies - to help musicians, after all.
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Agree. If it’s actually just wrong, correct it. Notation software has evolved beyond this. If anyone would ever need to see the clumsy misunderstandings in the original, then make a facsimile.
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I totally agree with your opinion. This notation looks strange for me as well. I just got a request to transpose this score from my friend, who is a soprano and has a plan to perform this song. And I thought this is a good chance to become familiar with Dorico, because I am quiet newbie at Dorico. This piece is composed by William Bolcom and I don’t know whether this composer directly notated this score or not. I am willing to change this strange notation to common way. I just was wondering if there are some functions to follow this notation, exactly in Dorico. Thanks for your advice!
Yes. Normalize it.
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I hope you’re transposing this piece up and not down, otherwise the last note will go off the bottom of the keyboard! 
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That sort of time signature is usually used on ly with orchestral full scores, the lines used to join the two or three oversized time signatures spread vertically across the instrument groups of the score. It has no business being used on a three-staff system. (IMO)
Even so, if done correctly, the oversized time signatures are clear enough without the added lines. (I think this is a Sibelius option; I haven’t seen it elsewhere.)
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I have seen a commercially-printed edition of this piece. When compared with the first picture in your original post, the time signatures are at normal size in the normal position (within each staff) without the extra connecting line, and the 16th grace notes do not have slashes. There are individual 8th grace notes in other bars. They have slashes, but any occurrences of 16th grace notes are unslashed.
I don’t know whether or not this piece has had more than one printing (perhaps by different publishers, maybe some years apart) and if so, whether or not the one I have seen is the original version. Whatever the case, it appears to follow normal/standard/traditional music publishing conventions, and is eminently understandable because of that.
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good to know that info. Thanks! 
So kind you are! Thank you very much for mention about details! I should find the orginal version at first. 
!